Description: Formula-building rule for restricted universal quantifiers (deduction form). (Contributed by NM, 28-Jan-2006) (Revised by Szymon Jaroszewicz, 16-Mar-2007)
Ref | Expression | ||
---|---|---|---|
Hypothesis | 2ralbidv.1 | |- ( ph -> ( ps <-> ch ) ) |
|
Assertion | 2ralbidv | |- ( ph -> ( A. x e. A A. y e. B ps <-> A. x e. A A. y e. B ch ) ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2ralbidv.1 | |- ( ph -> ( ps <-> ch ) ) |
|
2 | 1 | ralbidv | |- ( ph -> ( A. y e. B ps <-> A. y e. B ch ) ) |
3 | 2 | ralbidv | |- ( ph -> ( A. x e. A A. y e. B ps <-> A. x e. A A. y e. B ch ) ) |